What regrets does shin have of leaving camp 14 and North Korea?

Shin Dong-hyuk expresses deep regret over leaving Camp 14 and North Korea primarily due to the loss of his family and the familiar environment, despite the harsh conditions he endured there. He grApples with feelings of guilt about abandoning his fellow prisoners and the connections he had formed. Additionally, he reflects on the challenges of adapting to life outside the camp, where he faces a different set of struggles and the burden of his past experiences.